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The trailing `/` causes requests to be written with `//` and results in 404 responses from the ollama service.

This results in ollama models being unusable. Removing the training slash here resolves the issue.

This reverts commit 9763d885.

There are currently 2 issues with the Kubernetes manifest:

- open-webui-deployment refers to ollama-webui-pvc but not included in
  kustomization.yaml, causing issue if using GPU deployment
- ollama-webui-pvc is using the wrong namespace

This commit fixes both issue.